Trenchless Ultra-Short Radius Grouting for Wrap-Shaped Tunnel Reinforcement
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Solution Overview
Problem
Existing grouting technologies struggle to ensure the safety of simultaneous above-ground and underground construction in urban environments with dense buildings and tunnels, particularly due to limitations in horizontal drilling at short distances, affecting road and building safety during tunnel construction.
Innovation Solution
An underground trenchless ultra-short radius gradient wrapped grouting device and method utilizing a travel system, grouting system, and direction adjustment system, enabling 90-degree vertical borehole grouting and ultra-short radius horizontal grouting with a combined structure of connecting components to form a 'wrap' shaped reinforcement layer, using a specific grouting material composition and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grouting technology is used for reinforcing soil layers above tunnels, then the safety of tunnel construction is improved, but the ability to perform horizontal drilling at ultra-short radius is insufficient, limiting effectiveness in dense urban environments
Solution Approach 1:
The drilling device employs a dynamic direction adjustment system that allows real-time modification of drilling angle and trajectory during the grouting process. The adjustable drilling angle mechanism enables the system to adapt to ultra-short radius horizontal drilling requirements while maintaining vertical drilling capabilities, thus resolving the contradiction between reliability and adaptability in dense urban environments
Solution Approach 2:
The invention changes the drilling parameters including drilling angle, drilling depth, and horizontal curvature radius to achieve ultra-short radius horizontal directional drilling. By adjusting these parameters, the system can perform both vertical grouting for tunnel safety and horizontal grouting at tight radii for dense urban settings, simultaneously improving reliability and adaptability
2Productivity
If simultaneous above-ground and underground construction is performed to improve construction efficiency, then productivity is improved, but the safety of existing buildings and roads is compromised
Solution Approach 1:
The grouting device applies localized grouting reinforcement to specific areas above and around tunnels through precise directional drilling. The wrap-shaped reinforcement layer is created by injecting grouting material along curved trajectories that specifically target vulnerable zones, providing localized protection to existing buildings and roads while allowing simultaneous construction activities elsewhere
Solution Approach 2:
The invention performs preliminary grouting reinforcement of the soil layers above tunnels before or during simultaneous above-ground construction. By pre-establishing the wrap-shaped reinforcement layer through horizontal directional drilling and grouting, the system strengthens the ground in advance, ensuring safety of existing structures while enabling subsequent construction activities to proceed safely
3Reliability
If vertical grouting is performed to reinforce tunnel top safety, then tunnel construction safety is improved, but the ability to provide comprehensive reinforcement in three-dimensional space is insufficient
Solution Approach 1:
The invention transitions from purely vertical grouting to three-dimensional grouting by introducing horizontal directional drilling capability. The drill bit can be adjusted to create curved trajectories that extend grouting reinforcement into the horizontal dimension, forming a wrap-shaped reinforcement layer that envelops the tunnel in three-dimensional space, thus enhancing both tunnel top safety and overall spatial reinforcement capability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method and device provide enhanced safety and efficiency in tunnel construction by protecting roads and existing buildings, simplifying the construction process, and achieving better reinforcement effects while promoting green construction through in-situ recycling of engineering waste.
Implementation Method 1
a first hydraulic rod, a second hydraulic rod, a third hydraulic rod, and a fourth hydraulic rod... the direction adjustment system is configured for direction adjustment of a drill bit at a front end
Implementation Method 2
performing grouting on boreholes in a desired grouting reinforcement range... the horizontal grouting surface and the vertical grouting surface being completely grouted
Data Source
Figure 1
AI summary
The present invention discloses an underground trenchless ultra-short radius gradient wrapped grouting device and method, and belongs to the technical field of underground space grouting reinforcement. The device includes: a travel system, a grouting system, and a direction adjustment system, wherein the travel system includes an engine, a driving shaft, and a crawler belt, the engine is connected to the driving shaft, and the driving shaft is wrapped by the crawler belt. The device can achieve 90-degree vertical borehole grouting from the ground and ultra-short radius horizontally guided borehole grouting, is wider in application range, and higher in practicability. The "wrap" shaped reinforcement to the reinforcement range space is achieved after grouting to protect the safety of above-ground roads and the existing buildings at close distances on both sides of a tunnel and the safety of tunnel construction, which simplifies the construction process, and achieves better reinforcement effects.